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[Bug 1473088] Re: network manager peap mschapv2 authentication stopped working

 

According to a RH bug description, the problem lies on the server side
of connection.

Quote: " wpa_supplicant 2.4 may trigger this where 2.3 would not,
becuase 2.4 enables some new ciphers for use with TLSv1.2, and the
server may have enabled DH only for those ciphers that are now enabled.

The options are to either get your network admins to fix the DH key issue by using something > 768 bits, or to disable TLSv1.2 for now until they fix it."
https://bugzilla.redhat.com/show_bug.cgi?id=1241930

Too short DH key issue affects many programs (google it - sendmail,
postfix, mysql etc.)

Currently only option seems to be to downgrade wpa_supplicant to 2.3 as
it seems to work and wait till a) a failback mechanism will be
implemented to use older (and insecure!) TLS or SSL if TLS 1.2 fails or
b) all eduroam RADIUS servers will be upgraded (more like never).

** Bug watch added: Red Hat Bugzilla #1241930
   https://bugzilla.redhat.com/show_bug.cgi?id=1241930

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https://bugs.launchpad.net/bugs/1473088

Title:
  network manager peap mschapv2 authentication stopped working

Status in network-manager-applet package in Ubuntu:
  Confirmed

Bug description:
  Probably in a recent update, the connection to our MSCHAPv2 / PEAP network with security set to WPA/WPA2 Enterprise.
  It worked a few weeks back, but not any more.
  Many users have issues that are posted here:
  https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1104476

  Decided to make a new bug report because it is probably a new issue.

  Trying to connect fails and throws another screen where the password
  can be filled in.

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References